A5077367057- Advanced Polymer Synthesis and Characterization
- Hydrogels: synthesis, properties, applications
- Fuel Cells and Related Materials
- Advanced Cellulose Research Studies
- Polymer Surface Interaction Studies
- Advanced Battery Materials and Technologies
- Lignin and Wood Chemistry
- Surfactants and Colloidal Systems
- Conducting polymers and applications
- Crystallization and Solubility Studies
- Polysaccharides and Plant Cell Walls
- X-ray Diffraction in Crystallography
- Chemical Synthesis and Characterization
- Radioactive element chemistry and processing
- Proteins in Food Systems
- Electrospun Nanofibers in Biomedical Applications
- biodegradable polymer synthesis and properties
- Polysaccharides Composition and Applications
- Food Chemistry and Fat Analysis
- Pickering emulsions and particle stabilization
- Membrane-based Ion Separation Techniques
- Nanocomposite Films for Food Packaging
- Extraction and Separation Processes
- Supramolecular Self-Assembly in Materials
- Meat and Animal Product Quality
University of Helsinki
2016-2025
Helsinki Art Museum
2025
FishBase Information and Research Group
2018
Research Council of Finland
2013
Technical University of Denmark
2009
Swedish Chemicals Agency
1997
Polyoxometalates are an emerging class of molecular clusters, with well-defined structures and chemical compositions that produced through simple, low-cost, highly reproducible methods. In particular, the wheel-shaped cluster {Mo
Cellulose microfibrils physically bound together by soft hemicellulose chains form the scaffolding that makes plant cell walls strong. Inspired this architecture, we designed biomimetic thermoreversible hydrogel networks based on reinforcing cellulose nanocrystals (CNC) and thermoresponsive methylcellulose (MC). Upon dissolving MC powder in CNC aqueous dispersions, viscoelastic dispersions were formed at 20 °C, where storage modulus (G′) is tunable from 1.0 to 75 Pa upon increasing...
One of the major, but often overlooked, challenges toward high end applications nanocelluloses is to maintain their mechanical properties under hydrated or even fully wet conditions. As such, permanent covalent cross-linking surface hydrophobization are viable approaches, however, former may hamper processability and latter have adverse effect on interfibrillar bonding resulting material strength. Here we show a concept based physical cellulose nanofibers (CNF, also denoted as...
Strain-stiffening is one of the characteristic properties biological hydrogels and extracellular matrices, where stiffness increases upon increased deformation. Whereas strain-stiffening ubiquitous in protein-based materials, it has been less observed for polysaccharide synthetic polymer gels. Here we show that agarose, is, a common linear polysaccharide, forms helical fibrillar bundles cooling from aqueous solution. The with these semiflexible fibrils pronounced strain-stiffening. However,...
Thermosensitive ABC triblock copolymers with different block lengths and orders were prepared by reversible addition–fragmentation chain transfer (RAFT) polymerization. Using a nonionic macro-RAFT agent containing poly(ethylene oxide) (PEO, average degree of polymerization 17), either N-acryloylglycinamide (NAGA) or N-isopropylacrylamide (NIPAM) was first polymerized to diblock copolymers. The exhibited typical thermoresponsive character PNAGA PNIPAM in aqueous solutions. Chain extension the...
1-2-3 gel! Subcomponent self-assembly is introduced as a new design route towards multistimuli-responsive metallogels. It offers rapid and facile access to supramolecular gels allows smart materials with diverse functional structural properties by simply exchanging one (or more) of the components. Herein, exchange metal ions emphasized (see scheme).
Fiber spinning of anionic TEMPO-oxidized cellulose (TOCN) nanofibrils with polycations by interfacial polyelectrolyte complexation is demonstrated. The formed fibers were mostly composed and the a minor constituent, leading to yield ultimate strengths ca. 100 MPa 200 MPa, Young's modulus 15 GPa. Stretching as-formed wet filaments TOCN/polycation 20% increased modulus, strength, tensile strength approximately 45, 36, 26%, respectively. Importantly, feasibility compartmentalized wound...
Bauxite residue (BR) is an inevitable industrial waste generated through the classic Bayer extraction of alumina from bauxite minerals. It contains relatively significant amount valuable rare earth elements, including scandium, and therefore, we explored suitability trace scandium recovery BR acid leachate by titanium phosphate (TiP) ion exchangers. Three kinds TiP materials (amorphous TiP, α-TiP, γ-TiP) were synthesized fluorine-free precursors characterized chemical analysis, X-ray...
Phosphorylation of cellulose nanocrystals (CNCs) has remained a marginal activity despite the undisputed application potential in flame-retardant materials, sustainable high-capacity ion-exchange or substrates for biomineralization among others. This is largely due to strenuous extraction methods prone combination poor reproducibility, low degrees substitution, disappointing yields, and impractical reaction sequences. Here, we demonstrate an improved methodology relying on modification...
Microfluidic on-chip production of polymeric hydrogel microspheres (MPs) can be designed for the loading different biologically active cargos and living cells. Among gelation strategies, ionically crosslinked generally show limited mechanical properties, meanwhile covalently often require use crosslinking agents or initiators with biocompatibility. Inverse electron demand Diels Alder (iEDDA) click chemistry is a promising covalent method fast kinetics, high chemoselectivity, efficiency no...
Radiation grafted and sulfonated poly(vinylidene fluoride), PVDF, membranes have been studied by thermal analysis X-ray diffraction to determine the changes in membrane crystallinity structure during preparation. Commercial PVDF films were irradiated with an electron beam, styrene finally sulfonated. Both size of crystallites decrease grafting reaction. A further is observed sulfonation The residual was considerable (10–20%) even which had subjected severe reaction conditions. These results...
Aqueous dispersions of homo- and copolymer microgels N-isopropylacrylamide (NiPAm) N,N-diethylacrylamide (DEAm) with different compositions are temperature-dependently studied by means proton nuclear magnetic resonance spectroscopy (1H NMR) differential scanning calorimetry (DSC). Furthermore, the effect varying solvent composition adding methanol is investigated. Methanol addition leads to a broadening thermally induced volume phase transition in case NiPAm-containing samples, as confirmed...
Isotactic triads are introduced into poly(dimethylaminoethyl methacrylate) (PDMAEMA) when a Lewis acid yttrium(III)trifluoromethanesulfonate, Y(OTf)3, is present during the ATRP polymerization. The changes in tacticities of polymers modest. However, tacticity affects phase separation process but different way two studied cases, at pH 8 and 9. pH, thus charge polymer, balance between electrostatic stereochemical effects. Upon chain collapse, zeta potential polymer decreases discontinuously 9,...
The valorization of cellulose rich textile waste is promoted by the development a novel solid-state NMR method for quantification and polyester in blends. We applied 13C CP-MAS as tool structural characterization cotton Gaussian functions were used to integrate spectra obtained from set calibration standards order calculate sigmoidal curve. Acid hydrolysis was chosen reference method. results demonstrated that enables reliable determination both preconsumer postconsumer textiles suggests...
We show that composite hydrogels comprising methyl cellulose (MC) and nanocrystal (CNC) colloidal rods display a reversible enhanced rheological storage modulus optical birefringence upon heating, i.e., inverse thermoreversibility. Dynamic rheology, quantitative polarized microscopy, isothermal titration calorimetry (ITC), circular dichroism (CD), scanning transmission electron microscopy (SEM TEM) were used for characterization. The concentration of CNCs in aqueous media was varied up to...
Abstract This study aims at extending the understanding of toxicity mechanism ionic liquids (ILs) using various analytical methods and cytotoxicity assays. The eight ILs one zwitterionic compound was determined mammalian bacterial cells. time dependency IL assessed human corneal epithelial Hemolysis performed red blood cells results were compared with destabilization data synthetic liposomes upon addition ILs. effect on size zeta potential revealed information changes in lipid bilayer....
A self-regulated dynamic nanohybrid that can sensitively respond to hyperglycemic microenvironment is developed. The with a core/shell structure produced through single-step microfluidics nanoprecipitation method, where drugs-loaded porous silicon (PSi) nanoparticles are encapsulated by H<sub>2</sub>O<sub>2</sub> responsive polymeric matrix.
The mycelium composites composed of fungal and plant substrate are a practical alternative to petroleum plastic-based foam materials. However, the effects physiological traits fungus on composites' microscopic structure mechanical properties remain poorly understood. Here, we compared two basidiomycetes with distinct morphology white-decay modes. Cross-sectional observation revealed that possess core/shell shell formed dense aerial core particles spongy mycelium. Dense continuous networks...
Abstract Because of their lightweight structure, flexibility, and immunity to electromagnetic interference, polymer optical fibers (POFs) are used in numerous short‐distance applications. Notably, the incorporation luminescent nanomaterials POFs offers amplification sensing for advanced nanophotonics. However, conventional suffer from nonsustainable components processes. Furthermore, traditionally undergo photobleaching, oxidation, they can be cytotoxic. Therefore, biopolymer‐based...
Oleogels are semi-solid lipid-based materials designed to replace solid and fats in foods, cosmetics, pharmaceuticals. A new method for oleogel preparation through nanofibers has opened possibilities polymers from synthetic natural origins previously considered inadequate preparation. However, the obtained oleogels were made conventionally electrospun nanofibers, where production process still limitations or required different steps, such as use of organic solvents extensive drying steps. In...
Abstract The unique structure of [2.2]paracyclophane (PCP) with its rigidity, stability, and planar chirality has gained significant attention in polymer material research. In this work, the incorporation amino‐functionalized PCPs within polymers intrinsic microporosity (PIMs) is reported for first time. Three different PCP‐PIMs were prepared via a Tröger's base formation mechanism, their structures characterized solid‐state NMR, MALDI‐TOF, SEM. Their porosity was evaluated using gas...